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Schedule SE

Self-Employment Tax

Use this when: You have self-employment income (Schedule C profit) and need to calculate Social Security and Medicare tax.

Who needs it: Anyone with Schedule C profit of $400 or more
When to file: Attach to your Form 1040 when filing your annual return
Tax rate: 15.3% (12.4% Social Security + 2.9% Medicare)
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Understanding Self-Employment Tax

The Basics What this form does

What it is: The "other" tax bill you owe when you're self-employed.

Why you owe this tax:

When you have a W-2 job, your employer pays half your Social Security and Medicare tax (7.65%), and you pay the other half (7.65%). Total: 15.3%.

When you're self-employed, YOU are both the employer and the employee. So you pay both halves: 15.3% total.

THE GOOD NEWS: You get to deduct half of this tax (the "employer" portion) on your 1040, Line 15. So you don't pay income tax on money that went to self-employment tax.
EXAMPLE:

Téa's Schedule C profit: $8,800

Her self-employment tax: $8,800 × 15.3% = $1,346

She deducts half: $1,346 ÷ 2 = $673 (reduces her taxable income)

⚠ THIS IS SEPARATE FROM INCOME TAX: Self-employment tax is NOT your income tax. It's on TOP of income tax. So if you're in the 12% income tax bracket and owe 15.3% self-employment tax, you're really paying 27.3% total on your business profit.
Line 2 Net profit from Schedule C

What it is: Your profit from Schedule C, Line 31.

How to fill this out:

→ Copy the number from Schedule C, Line 31

EXAMPLE:

Téa's Schedule C, Line 31: $8,800 profit

Schedule SE, Line 2: $8,800

⚠ IF YOU HAVE A LOSS: If Schedule C shows a loss (like -$2,000), you don't owe self-employment tax. You can skip Schedule SE entirely.
Line 3 Multiply Line 2 by 92.35%

What it is: A slight reduction in the amount you pay tax on.

The math:

→ Line 2 × 0.9235 = Line 3

WHY 92.35%? The IRS lets you deduct the "employer" portion of SE tax before calculating the tax. This 92.35% accounts for that. Don't overthink it — just multiply.
EXAMPLE:

Téa's Line 2: $8,800

Line 3: $8,800 × 0.9235 = $8,127

Line 4 Multiply Line 3 by 15.3%

What it is: Your total self-employment tax.

The calculation:

→ Line 3 × 0.153 = Line 4

BREAKDOWN OF 15.3%:
  • 12.4% = Social Security tax
  • 2.9% = Medicare tax
  • Total = 15.3%
EXAMPLE:

Téa's Line 3: $8,127

Line 4: $8,127 × 0.153 = $1,243

This is what Téa owes in self-employment tax.

⚠ HIGH EARNERS: If your net profit is over $160,200 (2023 limit, adjusted annually), the Social Security portion (12.4%) caps out. You still pay the 2.9% Medicare tax on everything above that amount (plus an extra 0.9% Medicare surtax if you're really high income).
Line 6 Deduction for one-half of SE tax

What it is: Half of your SE tax that you can deduct on your 1040.

The math:

→ Line 4 ÷ 2 = Line 6

WHY YOU GET THIS DEDUCTION: Since you're paying both the "employer" and "employee" share, the IRS lets you deduct the employer share (half) to make it fair.
EXAMPLE:

Téa's Line 4 (total SE tax): $1,243

Line 6 (deduction): $1,243 ÷ 2 = $622

This $622 goes on Form 1040, Schedule 1, Line 15, reducing her taxable income.

HOW THIS HELPS:

If Téa's in the 12% tax bracket, this $622 deduction saves her $622 × 0.12 = $75 in income tax.

She pays $1,243 in SE tax but saves $75 in income tax, so her real cost is $1,168.

Quick Reference SE tax by profit level

Approximate SE tax you'll owe:

$5,000 profit

SE tax: ~$706

$10,000 profit

SE tax: ~$1,413

$20,000 profit

SE tax: ~$2,826

$40,000 profit

SE tax: ~$5,652

$60,000 profit

SE tax: ~$8,478

$100,000 profit

SE tax: ~$14,130

⚠ PLAN AHEAD: This tax is NOT withheld from your pay like W-2 jobs. You need to pay it quarterly (use Form 1040-ES) or save money to pay it when you file. Don't get caught off guard.

Common Mistakes to Avoid

1

Not saving for SE tax

Why it's wrong: You owe 15.3% on your profit, and it's not withheld. Many gig workers spend all their earnings and can't pay when tax day comes.

Fix: Save 25-30% of every payment you receive (covers SE tax + income tax). Use a separate savings account.

2

Thinking SE tax IS income tax

Why it's wrong: SE tax is separate from and in addition to income tax. You owe both.

Fix: Understand you're paying ~15% SE tax PLUS your income tax bracket (10%, 12%, 22%, etc.).

3

Not claiming the half-SE-tax deduction

Why it's wrong: You're entitled to deduct half your SE tax on Schedule 1, Line 15. Missing this costs you money.

Fix: Always transfer Line 6 from Schedule SE to your 1040, Schedule 1, Line 15.

4

Filing Schedule SE when you have a loss

Why it's wrong: If Schedule C shows a loss, you don't owe SE tax. Filing it anyway wastes time.

Fix: Only file Schedule SE if you have profit of $400 or more.

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You Might Also Need

Schedule C

Profit or Loss from Business

Calculate your profit first — that number flows to Schedule SE
1040-ES

Estimated Tax for Individuals

Pay your SE tax quarterly to avoid penalties
W-9

Request for Taxpayer ID

Give this to clients so they report your income correctly

Additional Resources

Official IRS Resources

Related Guides

Free Tools

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